iOS (jailbroken): You'll need to jailbreak your iPhone for this, but once you do, a simple tweak can put an accurate speedometer into the default Google Maps app so you can know exactly how fast you're currently traveling.

Jailbreaking is a process that changes little by little with each iOS upgrade. Rather than always…
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Many turn-by-turn GPS apps already include an speedometer feature, which uses the iPhone's accelerometer, but this free GMaps solution is fantastic for when you're on public transit, or in someone else's car and can't easily see the speedometer.

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Another app that MakeUseOf found is just called Speedometer, which gives you more detail, including historical tracking of your highest overall speed, which you can then share with your friends.